[SciPy-User] How to fix a parameter when using curve_fit ?

[Spark Liang]

Hi, would someone be so kind to tell me how to fix some parameters when
using curve_fit ?
I googled it and found that I may use scipy.odr or mpfit, but they seem
rather complicated.
I also searched the maillist, someone said it can be done by by writing a
nested function or a class. but how to do it?
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